Surface electromyography is a kind of human electric signals. It can reflect the condition of muscles and is viewed as a very powerful tool of diagnosis and treatment in modern medical techniques. The application of which plays a great role in the development of medical research, ergonomics, sports science and so on. In this paper，a program of surface electromyography-detected system was designed and developed under Visual C++6.0 in personal computer. This program could extract some important parameters from SEMG signal，calculate SEMG power spectrum by the use of algorithms，diplay SEMG waveform in real-time，print calculated SEMG parameters and waveform，and manage all the recorded data of SEMG by using MySQL. At the last stage of developing program，three electrodes were used to test flexor carpum radialis, flexor carpum ulnaris and brachioradialis on the right hand of subject，whose SEMG waveform and parameters in the static and active condition were successfully recorded.